Infrared photography of the sort done with film does not show heat escaping
from houses - it only records the infrared energy reflected by the subject.
The source of the infrared radiation is the sun or artificial light
sources - thus night time IR photography of black helicopters or other
subjects is usually a fruitless endevour. The film will record visible
light as well, so for the infrared effect, filters are used to block visible
radiation, in varying degrees. The following link is an excellent source:
http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM#FILM
Josh Putnam has more links:
http://www.phred.org/~josh/photo/photo.html
My practice to date has been to use Kodak HIE and a 25A (red) filter. This
allows some visible light in. Exposure is a crapshoot since meters are not
calibrated for IR - but I start with an EI of 200 metering through the
filter. I am about to try using an 87C gel which blocks all visible light.
This filter is placed between the film rails inside the body so that the
viewfinder is not obscured.
It is an interesting form of photography. Good luck!
Gary Edwards
----- Original Message -----
From: Mickey Trageser
To: olympus@xxxxxxxxxxxxxxx
Sent: Sunday, October 20, 2002 9:35 AM
Subject: [OM] Infrared?
We have serveral OM photographers in our midst who turn out incredible
images with the IR medium. I have only seen daylight shots offered for view.
Is the IR film not of the type that could detect heat leaks of a house at
night, or the heat from wam hoods in a darkened parking lot? I suppose that
would be even more difficult to visualize and determine exposure. What is
the real capablity of the film, and how does one determine appropriate
exposures? Are there color IR films, or is that a video imaging system I'm
thinking about?
When I look at one of the IR shots, is there some percentage of visible
light that influences the photo? Are some shot with filters and some not? Do
the filters render an image that is not useful in the viewfinder?
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